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OPERATION
DEPTH OF CUT
Aspreviously mentioned, the depth ofcut isimportantbe-
causeit affectsthe rate of feed which, in turn,affectsthe
qualityofa cut(and,also,thepossibilityof damagetoyour
routermotorandbit).A deepcutrequiresa slowerfeed than
a shallowone,anda toodeepcutwillcauseyoutoslowthe
feed somuchthatthe bit isno longercutting,itisscraping,
instead.
Makinga deep cut is never advisable.The smallerbits--
especiallythose only 1/16 inch in diameter ---are easily
brokenoffwhensubjectedtotoomuchsidethrust.A large
enoughbit maynotbe brokenoff,butifthecutistoodeepa
roughcutwillresult-- anditmaybeverydifficulttoguideand
controlthebitasdesired.Forthesereasons,werecommend
thatyoudo notexceed1/8inchdepthofcutina singlepass,
regardlessofthe bitsize orthe softnessor conditionofthe
workpiece.See Figure 10.
To make deepercutsit isthereforenecessaryto makeas
many successivepassesas required,loweringthe bit 1/8
inchforeachnewpass.Inordertosavetime,doallthecutting
necessaryatonedepthsetting,beforeloweringthebitforthe
nextpass.Thiswillalsoassureauniformdepthwhenthefinal
passiscompleted.See Figure11.
DIRECTION OF FEED AND THRUST
Theroutermotorandbitrevolveinaclockwisedirection.This
givesthe toola slighttendencytotwist(Inyourhands)in a
counterclockwisedirection,especiallywhenthemotorrevs
up(as at starting).
Becauseoftheextremelyhighspeedofbitrotationduringa
"proper feeding" operation,there is very littlekickbackto
contendwithundernormalconditions.However,shouldthe
bitstrikea knot,hard grain,foreign object,etc.thatwould
affectthenormalprogressofthecuttingaction,therewillbe
aslightkickback--sufficienttospoilthetruenessofyourcut
ifyou are not prepared. Such a kickbackis alwaysin the
directionoppositeto thedirectionofbitrotation.
To guard againstsuch a kickback,plan your set-upand
directionoffeedsothatyouwillalwaysbethrustingthetool--
toholditagainstwhateveryouareusingtoguidethecut--in
thesamedirectionthattheleadingedgeofthebitismoving.
In short,the thrustshouldbe in a directionthat keepsthe
sharpedgesof the bitcontinuouslybitingstraightintonew
(uncut)wood.
ROUTING
Wheneveryouareroutinga groove,yourtravelshouldbe in
a directionthatplaceswhateverguideyouare usingat the
right-handside. In short, when the guide is positionedas
shownin thefirstpart ofFigure12,tooltravelshouldbeleft
torightandcounterclockwisearoundcurves.Whentheguide
ispositionedas showninthe secondpartof Figure12 tool
travelshouldbe rightto leftandclockwisearoundcurves.If
thereisa choice,the first set-upisgenerallytheeasiestto
use.Ineithercase,thesidewaysthrustyouuseisagainstthe
guide.
DEPTH
OF CUT
Fig.10
2ND.PASSJ I / I _L_
GUIDE OUTSIDE,
_ TH_
Eoo
jou,o
THRUST" FEED
GUIDE INSIDE Fig.12
i
ROUTING WITH GUIDE BUSHINGS
WhenusingtheTemplateGuideBushingsItemNo.9-25082
with yourrouter,you mustvisuallycenter the bitwiththe
bushingbeforebeginningyourcut.Yourroutersubbasemay
beadjustedbylooseningthescrewsholdingthesubbaseto
yourrouter.Besureclampingleverissecurelylockedbefore
centedngbit in bushing.After centeringbit with bushing
tightenscrewsfirmly..
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